From 7cf7d9f672f3e1c81f9b62b59018a7fdfd9a8117 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Z=C3=A1mb=C3=B3=20Levente?= <zambo.levente@bardiauto.hu>
Date: Thu, 7 Sep 2023 16:46:26 +0200
Subject: [PATCH] create device open error type

---
 device.go | 4 ++--
 error.go  | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/device.go b/device.go
index 9ed1a84..32b37da 100644
--- a/device.go
+++ b/device.go
@@ -59,10 +59,10 @@ func (d *Device) Open(readState bool) (err error) {
 	if d.deviceInfo == nil {
 		return ErrDeviceInfoNotFound
 	}
-	
+
 	d.device, err = d.deviceInfo.Open()
 	if err != nil {
-		return
+		return fmt.Errorf("%w, %w", ErrDeviceOpen, err)
 	}
 
 	d.connected = true
diff --git a/error.go b/error.go
index c4882dd..d3f992d 100644
--- a/error.go
+++ b/error.go
@@ -5,6 +5,7 @@ import "errors"
 // Error types
 var (
 	ErrNoDeviceFound         = errors.New("no device found")
+	ErrDeviceOpen            = errors.New("cannot connect to device")
 	ErrDeviceInfoNotFound    = errors.New("cannot connect to device, device information not found")
 	ErrDeviceNotConnected    = errors.New("device is not connected, call Open()")
 	ErrInvalidNumberOfRelays = errors.New("invalid number of relays found")